/Engine/Plugins/Experimental/SlateScreenReader/Source/SlateScreenReader/Public/SlateScreenReaderEngineSubsystem.h
Returns true if the screen reader is speaking text to a particular user. Returns false if no no announcements are being spoken to the user or if the user Id is not registered.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="SlateScreenReader") bool IsSpeaking ( UPARAM(DisplayName="Screen Reader User Id") int32 InUserId ) const